Tool holder



March 24, 1931. F, c K 1,797,986

OOOOOOOO FR ed May 15, 1929 if )4: l

Patented Mar. 24, 1931 UNITED STATES PATENT OFFICE FLOYD C. KING, OF DETROIT, MICHIGAN, ASSIGNOR TO GUARDIAN TRUST COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN, TRUSTEE TOOL HOLDER Application filed Kay 13, 1929. Serial No. 362,527.

. This invention .relates generally to tool holders, especially punch and die retainers, and consists of certain novel features of construction, combinations, and arrangements of parts that will be hereinafter more fully described, and particularly pointed out in the appended claims.

Heretofore punch and die retainers have been constructed in such a way that the 1 punches or dies have been held in the retainers by the wedge action of spring pressed balls -or other parts. In fact, in some instances the wedging action has been so pronounced that it has been extremely diflicult and inconvenient to remove the punches or dies from the holders. Likewise such constructions had to be practically taken apart when the retainer bodies containing the balls, etc., were initially secured to the punch base castings. In some instances hardened backing plates have been used for the punches, but as illustrated in Richard 1,621,811, the plate is set in the base casting, hence is entirely separate from the retainer body and cannot be adjusted therewith relative to the base casting. Moreover, with such constructions the l cation of the hardened backing plate has to he laid out on the casting very accurately and the casting has to be machined to receive such plate. This machining operation is quite costly and eliminates the possibility of shiftin the centers of the punch without entirely estroying the purposes in mind.

With the present invention, however, the objectionable features just referred to have been overcome entirely by the provision of a self-contained retainer and hardened plate assembly thatas a unit may be sold, secured to, shifted relative to, or removed from the base casting without disturbing the base casting. In this connection it will be noted that the hardened backing plate of my construction is held against the base casting by the same bolts that secure the retainer body to the castin Moreover, the means in the retainer body for holding the punch or die has been greatly simplified and the cost of manufacturing the same has accordingly been reduced.

In' the accompanying drawing:

Figure 1 is' a vertical sectional view through a retainer and hardened backing plate assembly embodying my invention and showing the same applied to the base cast-" ing of a punch press;

Figure 2 is a sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a detail view of the plunger;

Figure 4 is a detail view of the screw.

Referring now to the drawing,'1 is a punch, 2 is a retainer body having a bore 3 receiving the shank 4 of the punch, 5 is a plunger movable longitudinally in a bore 6 in the body to retain the shank 4: in the bore, 7 is a screw adjustable in the body to actuate the p1unger, 8 is a base casting of a punch press to which the body 2 is secured by bolts 9, and 10 is a hardened plate in the body at the upper end of the bore 3 and constituting a backing for the punch shank 4.

As shown, the punch 1 is of conventional form and is provided at the lower end of the shank 4 with the usual reduced work engaging head 11. The body 2 may be formed of any suitable material and may be any shape desired. Preferably, the construction and arrangement of parts are such that the body 2, plunger 5, screw 7 and hardened backing plate 10 are assembled as a unit and as such are attachable to or detachable from the base casting 8. Preferably the bore 6 receiving the plunger 5 is disposed at substantially an acute angle to the bore 3 and communicates therewith at the upper end thereof, while the threaded socket 12 receiving the screw 7 is at the lower end of the bore 6 and is -'substantially parallel to the bore 3. The hardened plate 10 is preferably centered relative to the bore 3 and base pressed fit in the upwardly opening recess 13 in the upper face of the body, the depth of said plate 10 being equal to the depth of the recess 13 so that the upper face of the plate is flush with the upper face of the body. Thus, the base 8 is devoid of recesses except the sockets 14 that receive the bolts 9.

In practice, the body 2 with the hardened plate 10,. plunger 5 and screw 7 therein may be shifted as desired over the lower face of Inn the base 8 before the latter is provided with the sockets 14, and after such body is located as desired, the sockets 14 are then formed to receive the bolts 9. The body 2 and plate '10 as a unit may then be secured to the base 8 by means of the bolts 9 and this may be accomplished while the plate 10, plunger 5 and screw 7 are within the body and without disturbing the same.

In use the screw 7 may be lowered by turn.- ing the same in the socket 12 permitting the plunger 5 to fall by gravity in the bore 6 and permitting the insertion of the punch shank 4 with the bore 3. The screw 7 may then be raised by turning the same within the socket 12 to push the plunger 5 upwardly in the bore 6 until the upper end of such plunger is re ceived in the laterally opening recess 15 in the punch shank 4. The punch is then held against the plate 10 in the body for use. After use the punch may be easily and quickly removed by merely lowering the screw 7 as previously described to permit the plunger 5 to drop in the bore 6 away from the recess 15in the punch shank and thereby free the latter to permit withdrawal thereof from the bore 3.

While it is believed that from the foregoing description, the nature and advantage of my invention will be readily apparent, I desire to have it'understood that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What I claim asmy invention is:

1. In a tool holder, a body having means for receiving a tool, and means entirely within said body for holding a tool in said receiving means including a screw adjustable within said body in a plane substantially parallel to the receiving means aforesaid, and a plunger disposed at substantially an obtuse angle to and actuable directly by said screw into contacting relation with a tool in said receiving means.

2. In a tool holder, a body having two bores and a socket, one of said bores and said'socket being substantially parallel, and the other of said bores extending between said socket and first mentioned here and disposed at substantially an acute angle to the latter, and means for holding the shank of a tool in the first mentioned bore including an element movable longitudinally in the last mentioned bore, and a follower for said element adjustable in said socket. I

3. In a tool holder, a body having a bore and a socket disposed in substantially parallel relation to each other, the here being adapted to receive the shank of a tool, a screw in the socket, and means disposed at substantially an acute angle to the bore and movable by the screw in the socket into engagement with the tool shank in the bore.

4. In a tool holder, a body having two bores and a socket, one bore and the socket being substantially parallel, and the other bore inclining upwardly from the socket to the first mentioned bore, said first mentioned bore be ing adapted to receive the shank of a tool, a rotatable element adjustable longitudinally of the socket, and means adapted to be moved upwardly in the last mentioned bore by the rotatable element so as to engage a tool shank in the first mentioned bore and movable downwardly in the last mentioned bore away from the tool shank by the action of gravity alone.

In testimony whereof I aflix my signature.

FLOYD. G. KING. 

